Mark rules_rust as a non-dev dependency

This is a critical step towards public rust_proto_library() support.

We previously held this back due to concerns about bloat, but investigation has shown that rules_rust is set up sufficiently that the Rust toolchain will not be installed unless the user affirmatively uses rust_proto_library(), which makes the bloat concerns minimal.

PiperOrigin-RevId: 874423531

Author: protobuf-github-bot

MODULE.bazel

@@ -43,8 +43,8 @@ bazel_dep(name = "rules_kotlin", version = "1.9.6")
 bazel_dep(name = "rules_license", version = "1.0.0")
 bazel_dep(name = "rules_pkg", version = "1.0.1")
 bazel_dep(name = "rules_python", version = "1.6.0")
+bazel_dep(name = "rules_rust", version = "0.63.0")
 
-bazel_dep(name = "rules_rust", version = "0.63.0", dev_dependency = True)
 bazel_dep(name = "rules_ruby", version = "0.17.3", dev_dependency = True)
 
 # Workaround for https://github.com/bazelbuild/bazel-central-registry/issues/4230
@@ -192,14 +192,14 @@ register_toolchains(
 rust = use_extension("@rules_rust//rust:extensions.bzl", "rust", dev_dependency = True)
 
 # As of October 2025, our minimum supported Rust version is 1.79. However, we
-# use 1.85.0 here so that we can get some test coverage with edition 2024.
-# Cargo and our Bazel WORKSPACE build are both still on edition 2021.
+# use 1.85.0 here so that we can get some test coverage with Rust edition 2024.
+# Cargo and our Bazel WORKSPACE build are both still on Rust edition 2021.
 rust.toolchain(
     edition = "2024",
     versions = ["1.85.0"],
 )
 
-crate = use_extension("@rules_rust//crate_universe:extension.bzl", "crate", dev_dependency = True)
+crate = use_extension("@rules_rust//crate_universe:extension.bzl", "crate")
 crate.spec(
     package = "googletest",
     version = ">0.0.0",